Was it at five o’clock ______the fire br 发布时间:2017-06-04 18:24 │ 来源:www.tikuol.com 题型:选择题 问题: Was it at five o’clock ______the fire broke out?A.whenB.thatC.whichD.in which
题型:选择题 已知向量p=(-cos 2x,a),q=(a,2-3sin 2x),函数f(x)=p•q-5(a∈R,a≠0).(1)求函数f(x)(x∈R)的值域;(2)当a=2时,若对任意的t∈R,函数y=f(x),x∈(t,t+b]的图象与直线y=-1有且仅有两个不同的交点,试确定b的值(不必证明),并求函数y=f(x)的在[0,b]上单调递增区间. 查看答案